| extempore(adjective, adverb, free, casual, spontaneous) |
| impromptu(noun, adjective, adverb, free, affected) |
| off the cuff(expression, adjective, idiom, adverb, free) |
| offhand(adjective, adverb, free, informal, casual) |
| wing it |
| extemporaneous(adjective, adverb, impulsive, spontaneous, unprepared) |
| unprepared(adjective, free, informal, casual, snap) |
| unpremeditated(adjective, free, informal, casual, snap) |
| ad libitum(expression, adjective, adverb, impulsive, unprepared) |
| spontaneous(adjective, free, informal, snap, unprepared) |
| unplanned(adjective, free, informal, casual, unprepared) |
| unstudied(adjective, free, informal, casual, unprepared) |
| extemporary(adjective, free, casual, spontaneous, unprepared) |
| play by ear(noun, verb, expression, idiom, arrange) |
| unrehearsed(adjective, adverb, free, informal, impulsive) |
| by ear(expression, adjective, free, informal, casual) |
| extemporaneously(adverb, impromptu, spontaneously, improv) |
| extemporize |
| extemporized(adjective, spontaneous, unprepared, unplanned, unrehearsed) |
| improvise |